<ion-slides pager>
 
  <ion-slide>
    <img class="welcomepic" src="assets/images/welcome1.jpg" />
  </ion-slide>
  
  <ion-slide>
            <img class="welcomepic" src="assets/images/welcome2.jpg" />
            <button id="goHome" light (click)="goToHome()">立即启动</button>
  </ion-slide>
</ion-slides>